Public Affairs/Administration is a more applied version of Political Science. My S switched from PoliSci to Public Affairs because he preferred the practice to the theory, and he’s had a lot of courses in things like housing, transportation, parking, etc instead of political theory. But nothing relevant to law enforcement or being a lawyer.
I’d pick based on what you prefer studying, not specifically for job prospects. An MPA is generally done several years into a career (and can follow a BA in a wide range of majors), so is not directly relevant to your situation. As an undergrad you’ll have better prospects if you excel in your classes, so you should choose what you enjoy and do best in.